include/crypto/algapi.h

   1 /*
   2  * Cryptographic API for algorithms (i.e., low-level API).
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12 #ifndef _CRYPTO_ALGAPI_H
  13 #define _CRYPTO_ALGAPI_H
  14
  15 #include <linux/crypto.h>
  16 #include <linux/list.h>
  17 #include <linux/kernel.h>
  18
  19 struct module;
  20 struct rtattr;
  21 struct seq_file;
  22
  23 struct crypto_type {
  24         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
  25         unsigned int (*extsize)(struct crypto_alg *alg,
  26                                 const struct crypto_type *frontend);
  27         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
  28         int (*init_tfm)(struct crypto_tfm *tfm,
  29                         const struct crypto_type *frontend);
  30         void (*show)(struct seq_file *m, struct crypto_alg *alg);
  31         struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
  32
  33         unsigned int type;
  34         unsigned int maskclear;
  35         unsigned int maskset;
  36         unsigned int tfmsize;
  37 };
  38
  39 struct crypto_instance {
  40         struct crypto_alg alg;
  41
  42         struct crypto_template *tmpl;
  43         struct hlist_node list;
  44
  45         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  46 };
  47
  48 struct crypto_template {
  49         struct list_head list;
  50         struct hlist_head instances;
  51         struct module *module;
  52
  53         struct crypto_instance *(*alloc)(struct rtattr **tb);
  54         void (*free)(struct crypto_instance *inst);
  55
  56         char name[CRYPTO_MAX_ALG_NAME];
  57 };
  58
  59 struct crypto_spawn {
  60         struct list_head list;
  61         struct crypto_alg *alg;
  62         struct crypto_instance *inst;
  63         u32 mask;
  64 };
  65
  66 struct crypto_queue {
  67         struct list_head list;
  68         struct list_head *backlog;
  69
  70         unsigned int qlen;
  71         unsigned int max_qlen;
  72 };
  73
  74 struct scatter_walk {
  75         struct scatterlist *sg;
  76         unsigned int offset;
  77 };
  78
  79 struct blkcipher_walk {
  80         union {
  81                 struct {
  82                         struct page *page;
  83                         unsigned long offset;
  84                 } phys;
  85
  86                 struct {
  87                         u8 *page;
  88                         u8 *addr;
  89                 } virt;
  90         } src, dst;
  91
  92         struct scatter_walk in;
  93         unsigned int nbytes;
  94
  95         struct scatter_walk out;
  96         unsigned int total;
  97
  98         void *page;
  99         u8 *buffer;
 100         u8 *iv;
 101
 102         int flags;
 103         unsigned int blocksize;
 104 };
 105
 106 extern const struct crypto_type crypto_ablkcipher_type;
 107 extern const struct crypto_type crypto_aead_type;
 108 extern const struct crypto_type crypto_blkcipher_type;
 109 extern const struct crypto_type crypto_hash_type;
 110
 111 void crypto_mod_put(struct crypto_alg *alg);
 112
 113 int crypto_register_template(struct crypto_template *tmpl);
 114 void crypto_unregister_template(struct crypto_template *tmpl);
 115 struct crypto_template *crypto_lookup_template(const char *name);
 116
 117 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 118                       struct crypto_instance *inst, u32 mask);
 119 void crypto_drop_spawn(struct crypto_spawn *spawn);
 120 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 121                                     u32 mask);
 122
 123 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 124                                     struct crypto_instance *inst)
 125 {
 126         spawn->inst = inst;
 127 }
 128
 129 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 130 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 131 const char *crypto_attr_alg_name(struct rtattr *rta);
 132 struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask);
 133 int crypto_attr_u32(struct rtattr *rta, u32 *num);
 134 struct crypto_instance *crypto_alloc_instance(const char *name,
 135                                               struct crypto_alg *alg);
 136
 137 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 138 int crypto_enqueue_request(struct crypto_queue *queue,
 139                            struct crypto_async_request *request);
 140 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 141 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
 142
 143 /* These functions require the input/output to be aligned as u32. */
 144 void crypto_inc(u8 *a, unsigned int size);
 145 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
 146
 147 int blkcipher_walk_done(struct blkcipher_desc *desc,
 148                         struct blkcipher_walk *walk, int err);
 149 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 150                         struct blkcipher_walk *walk);
 151 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 152                         struct blkcipher_walk *walk);
 153 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 154                               struct blkcipher_walk *walk,
 155                               unsigned int blocksize);
 156
 157 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 158 {
 159         unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
 160         unsigned long align = crypto_tfm_alg_alignmask(tfm);
 161
 162         if (align <= crypto_tfm_ctx_alignment())
 163                 align = 1;
 164         return (void *)ALIGN(addr, align);
 165 }
 166
 167 static inline struct crypto_instance *crypto_tfm_alg_instance(
 168         struct crypto_tfm *tfm)
 169 {
 170         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
 171 }
 172
 173 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 174 {
 175         return inst->__ctx;
 176 }
 177
 178 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
 179         struct crypto_ablkcipher *tfm)
 180 {
 181         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
 182 }
 183
 184 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 185 {
 186         return crypto_tfm_ctx(&tfm->base);
 187 }
 188
 189 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 190 {
 191         return crypto_tfm_ctx_aligned(&tfm->base);
 192 }
 193
 194 static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
 195 {
 196         return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
 197 }
 198
 199 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
 200 {
 201         return crypto_tfm_ctx(&tfm->base);
 202 }
 203
 204 static inline struct crypto_instance *crypto_aead_alg_instance(
 205         struct crypto_aead *aead)
 206 {
 207         return crypto_tfm_alg_instance(&aead->base);
 208 }
 209
 210 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
 211         struct crypto_spawn *spawn)
 212 {
 213         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 214         u32 mask = CRYPTO_ALG_TYPE_MASK;
 215
 216         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
 217 }
 218
 219 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 220 {
 221         return crypto_tfm_ctx(&tfm->base);
 222 }
 223
 224 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 225 {
 226         return crypto_tfm_ctx_aligned(&tfm->base);
 227 }
 228
 229 static inline struct crypto_cipher *crypto_spawn_cipher(
 230         struct crypto_spawn *spawn)
 231 {
 232         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 233         u32 mask = CRYPTO_ALG_TYPE_MASK;
 234
 235         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 236 }
 237
 238 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 239 {
 240         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 241 }
 242
 243 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
 244 {
 245         u32 type = CRYPTO_ALG_TYPE_HASH;
 246         u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
 247
 248         return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
 249 }
 250
 251 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
 252 {
 253         return crypto_tfm_ctx(&tfm->base);
 254 }
 255
 256 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 257 {
 258         return crypto_tfm_ctx_aligned(&tfm->base);
 259 }
 260
 261 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 262                                        struct scatterlist *dst,
 263                                        struct scatterlist *src,
 264                                        unsigned int nbytes)
 265 {
 266         walk->in.sg = src;
 267         walk->out.sg = dst;
 268         walk->total = nbytes;
 269 }
 270
 271 static inline struct crypto_async_request *crypto_get_backlog(
 272         struct crypto_queue *queue)
 273 {
 274         return queue->backlog == &queue->list ? NULL :
 275                container_of(queue->backlog, struct crypto_async_request, list);
 276 }
 277
 278 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
 279                                              struct ablkcipher_request *request)
 280 {
 281         return crypto_enqueue_request(queue, &request->base);
 282 }
 283
 284 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 285         struct crypto_queue *queue)
 286 {
 287         return ablkcipher_request_cast(crypto_dequeue_request(queue));
 288 }
 289
 290 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 291 {
 292         return req->__ctx;
 293 }
 294
 295 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
 296                                           struct crypto_ablkcipher *tfm)
 297 {
 298         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
 299 }
 300
 301 static inline void *aead_request_ctx(struct aead_request *req)
 302 {
 303         return req->__ctx;
 304 }
 305
 306 static inline void aead_request_complete(struct aead_request *req, int err)
 307 {
 308         req->base.complete(&req->base, err);
 309 }
 310
 311 static inline u32 aead_request_flags(struct aead_request *req)
 312 {
 313         return req->base.flags;
 314 }
 315
 316 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 317                                                      u32 type, u32 mask)
 318 {
 319         return crypto_attr_alg(tb[1], type, mask);
 320 }
 321
 322 /*
 323  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 324  * Otherwise returns zero.
 325  */
 326 static inline int crypto_requires_sync(u32 type, u32 mask)
 327 {
 328         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 329 }
 330
 331 #endif  /* _CRYPTO_ALGAPI_H */
 332